Fiberglass liners are also much tougher than plastic liners, and can handle more abuse before damage and leaks will occur. In contrast, fiberglass liners need no confinement whatsoever and can even remain freestanding on the ground while filled with water. Plastic liners are less expensive than fiberglass liners or box-welded liners, but must be fully confined inside the ground to prevent the liner from flexing, and as a result, cracking. In general, there are three common materials available for preformed ponds: rigid plastic, fiberglass and flexible liner that is box-welded to create a certain shape. However, that being said, you could always start small in the beginning and then build a second or adjoining pond later. If you do decide to go with a preformed pond liner, and would like to leave your options open for the future, try to get the deepest pond you can, with a volume of water in excess of 1000L since larger volumes of water react slower to temperature changes. The problem with many rigid pond liners is that often times they are simply too shallow to properly control the water temperature for fish. Over time, you may desire a more advanced pond, such as a koi or goldfish pond. However, like many other hobbies, pond keeping can slowly enthrall a person. If you're the type of person who is good with planning, then this may not be a problem. The main disadvantage of preformed pond liners is that once you buy a liner, your pond design is set in stone and can't be changed without purchasing a new liner. However, to be clear, this isn't the case with all preformed liners since plastic liners require full confinement in the ground to prevent cracking. This means that a fiberglass pond can be installed above ground, and then later hidden with landscaping. Because fiberglass is quite rigid, the pond can be placed on the ground and filled with water straight away, with no other support necessary. In the case of using fiberglass preformed pond liners, an important advantage is the ease of installation.
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